Keep file permissions during database migration

[apricote]

PR #5290 added auto-migration to the docker entrypoint. It introduced a small security issue, by changing the file permissions of the app.ini to 644 (read permissions for all users). The the app.ini contains multiple credentials (smtp, database).

Either the user should be reponsible for appropriate file permissions, or the file permissions should be changed so that only the user can read this file (600).

This PR removes the file permission change, so the user is responsible for that. I can change it to setting secure permissions if requested.

[codecov-io]

Codecov Report

Merging #5707 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5707      +/-   ##
==========================================
- Coverage   37.77%   37.76%   -0.01%     
==========================================
  Files         323      323              
  Lines       47595    47595              
==========================================
- Hits        17977    17975       -2     
- Misses      27029    27031       +2     
  Partials     2589     2589

Impacted Files	Coverage Δ
models/repo_list.go	63.29% <0%> (-1.27%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update abb364f...c1d4450. Read the comment docs.

[zeripath]

Sorry I missed this on the earlier PR